Below is a video Tadashi made for me that goes over this very thing. This is what popped into my head on a tee box late in the season last year. I said to cock the left shoulder in, he said to being the right shoulder back. Same thing.
Thanks again for the tip Freddie!
Thanks Smalls and Tadashi for this tip. It worked wonders today. My first 5 holes I was pushing or slicing my Drives and then got caught in a Thunderstorm. While sitting in the clubhouse waiting to let the storm pass, I thought of this video. When play resummed I concentrated on the shoulder and started to hit straight drives.
I think over time we all get complacent and if it feels comfortable we just swing and can't quite figure out what has gone wrong. I felt like I was lining up correctly but with the shoulder open the results were'nt there. Thanks again.